Brand-new DS NC 0.25ohm Head: Being capable of working under high wattage, the newly introduced NC coil will give you large vapor and great flavor. It can also work under VW, Bypass, TC-SS and TCR modes.Innovative DS Dual 0.25ohm Head: Consisting of two stainless coils vertically placed in parallel, the dual coil is compatible with VW and Bypass modes.Both of them can be compatible with Wismec Motiv and Wismec Orma tank.DS NC 0.25Ohm Atomizer Head Wattage Range: 25W-40WDS Dual 0.25Ohm Atomizer Head Wattage Range: 25W-60W